Monsanto Co. (MON) is rising more than 1 percent to $83.10. The company's second quarter profit and net sales increased from the previous year. In addition, the company raised its full-year ongoing EPS and free cash flow guidance.

DDi Corp. (DDIC) is gaining 6 percent to $12.98. Viasystems Group Inc. (VIAS) announced that it would acquire the company for $13.00 per share in cash.

Magal Security Systems Ltd. (MAGS) is rising over 23 percent to $5.63. The company swung to a profit in its fourth quarter. Revenues jumped 122.9 percent year-over-year.

Zynga, Inc. (ZNGA) is rising over 2 percent to $12.60. The company announced the completion of public offering of an aggregate of 49.41 million shares of its Class A common stock.

Decliners:

SanDisk Corp. (SNDK) is falling 7 percent to $46.38. The company lowered its revenue guidance for the first quarter of 2012, citing weaker than expected pricing and demand.

Walgreen Co. (WAG) is declining 1 percent to $33.43. he company said comparable store sales and total sales declined 6.8 percent and 4.3 percent, respectively.. The company added that it anticipates that much of its Easter sales will be reflected in April results.